Drill collar

No.

Outer diameter

Inner diameter

Length mm

Should chamfering diameter

Bending strength

mm

in

mm

in

NC23-31

79.4

3 1/8

31.8

1 1/4

9150

76.2

2.57:1

NC26-35

88.9

3 1/2

38.1

1 1/2

9150

82.9

2.421

NC31-41

104.8

4 1/8

50.8

2

91509450

100.4

2.43:1

NC35-47

120.7

4 3/4

50.8

2

91509450

114.7

2.58:1

NC38-50

127.0

5

57.2

2 1/4

91509450

121.0

2.38:1

NC44-60

152.4

6

57.2

2 1/4

91509450

144.5

2.491

NC44-60

152.4

6

71.4

2 13/16

91509450

144.5

2.84:1

NC44-62

158.8

6 1/4

57.2

2 1/4

91509450

149.2

2.91:1

NC46-62

158.8

6 1/4

71.4

2 13/16

91509450

150.0

2.63:1

NC46-65

165.1

6 1/2

57.2

2 1/4

91509450

154.8

2.76:1

NC46-65

165.1

6 1/2

71.4

2 13/16

91509450

154.8

3.05:1

NC46-67

171.4

6 3/4

57.2

2 1/4

91509450

159.5

3.18:1

NC50-67

171.4

6 3/4

71.4

2 13/16

91509450

159.5

2.37:1

NC50-70

177.8

7

57.2

2 1/4

91509450

164.7

2.54:1

NC50-70

177.8

7

71.4

2 13/16

91509450

164.7

2.73:1

NC50-72

184.2

7 1/4

71.4

2 13/16

91509450

169.5

3.12:1

NC56-77

196.8

7 3/4

71.4

2 13/16

91509450

185.3

2.70:1

NC56-80

203.2

8

71.4

2 13/16

91509450

190.1

3.02:1

6 5/8REG

209.6

8 1/4

71.4

2 13/16

91509450

195.7

2.93:1

NC61-90

228.6

9

71.4

2 13/16

91509450

212.7

3.17:1

7 5/8REG

241.3

9 1/2

76.2

3

91509450

223.8

2.81:1

NC70-97

247.6

9 3/4

76.2

3

91509450

232.6

2.57:1

NC70-100

254.0

10

76.2

3

91509450

237.3

2.81:1

8 5/8 REG

279.4

11

76.2

3

91509450

266.7

2.84:1